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A-Level Bio - Photosynthesis

Why does a decrease in the concentration of carbon dioxide make a decreased quantity of GP, and an increased amount of RuBP?
I'm trying very hard to understand this. Thank you.

Reply 1

lane_in_pain

Original post by lane_in_pain

Why does a decrease in the concentration of carbon dioxide make a decreased quantity of GP, and an increased amount of RuBP?
I'm trying very hard to understand this. Thank you.

AAA wait. I think I might have it.
Is it because less RuBP is being used as CO2 is required for the carboxylation of RuBP to GP, and less GP is being produced for this reason. ??

Reply 2

SolsticeSerpent

Original post by lane_in_pain

Why does a decrease in the concentration of carbon dioxide make a decreased quantity of GP, and an increased amount of RuBP?
I'm trying very hard to understand this. Thank you.

I think it's because CO2 reacts with RuBP (catalysed by the enzyme rubisco) to make GP. So, less CO2 = less GP and more RuBP (due to less of it reacting with CO2).

(Hope I helped, currently struggling through photosynthesis myself :bigsmile:

)

Reply 3

tomedward

So a decrease in CO2 will lead to reduced carbon fixation to G3P (The first step where CO2 is used.). However, the G3P will continue the cycle to regenerate RuBP as ATP and NADPH are not limited. This will use up the G3P explaining the reduce in quantity. There is now not enough CO2 to use up the RuBP so it accumulates.

(edited 2 years ago)

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A-Level Bio - Photosynthesis

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